From 258c048f643fff59be15f43f126629a356ef60fa Mon Sep 17 00:00:00 2001
From: Timm Baeder <tbaeder@redhat.com>
Date: Fri, 4 Jul 2025 16:10:12 +0200
Subject: [clang][bytecode] Fix copy constructors for empty unions (#147050)

Nothing to do in that case.
---
 clang/lib/AST/ByteCode/Compiler.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'clang/lib/AST/ByteCode/Compiler.cpp')

diff --git a/clang/lib/AST/ByteCode/Compiler.cpp b/clang/lib/AST/ByteCode/Compiler.cpp
index 20580c8..5ed65f2 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -5836,6 +5836,8 @@ bool Compiler<Emitter>::compileConstructor(const CXXConstructorDecl *Ctor) {
     return false;
 
   if (R->isUnion() && Ctor->isCopyOrMoveConstructor()) {
+    if (R->getNumFields() == 0)
+      return this->emitRetVoid(Ctor);
     // union copy and move ctors are special.
     assert(cast<CompoundStmt>(Ctor->getBody())->body_empty());
     if (!this->emitThis(Ctor))
-- 
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